Linux Shell Scripting

5.

Functions and Modular Programming

5.1.

Function Basics

5.1.1.

Function Definition Syntax

5.1.2.

Alternative Function Syntax

5.1.3.

Function Naming Conventions

5.1.4.

Function Documentation

5.2.

Function Invocation

5.2.1.

Calling Functions

5.2.2.

Function Arguments

5.2.3.

Return Values and Exit Status

5.3.

Parameter Handling

5.3.1.

Positional Parameters in Functions

5.3.2.

Parameter Shifting

5.3.3.

Default Parameter Values

5.3.4.

Variable Number of Arguments

5.4.

Variable Scope in Functions

5.4.1.

Global Variables

5.4.2.

Local Variables

5.4.3.

Variable Shadowing

5.4.4.

Best Practices for Scope

5.5.

Function Return Values

5.5.1.

Exit Status Returns

5.5.2.

5.5.3.

Global Variable Modification

5.5.4.

Complex Return Data

5.6.

Advanced Function Concepts

5.6.1.

Recursive Functions

5.6.2.

Function Libraries

5.6.3.

Dynamic Function Creation

5.6.4.

Function Overriding

5.7.

Script Organization

5.7.1.

Sourcing External Scripts

5.7.2.

Creating Function Libraries

5.7.3.

Modular Script Design

5.7.4.

Code Reusability

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6. Data Structures and Text Processing